Okay kiddo, so khagol mandal means "astronomical society" in Hindi. It's a group of people who really love learning about space and stars and planets and all that cool stuff. They get together to share their knowledge and help each other learn even more.
Sometimes they use really big telescopes to look up at the sky and see all the stars and planets. They might also look at pictures and videos that scientists have taken of things in space that we can't see with our own eyes.
Khagol mandal is really cool because it helps people learn about things that are very far away and hard to understand. But it's also fun because you get to meet other people who love space, just like you!